the vernal equinox

Nowruz (New Year)
Afghanistan, Iran, Baha’i, Kurdish, Parsi

Pocahontas’ Death Funeral Anniversary (Native American)

Eric Weis­stein’s Trea­sure Trove of Astronomy

Eggs and the Ver­nal Equinox

And, of course, the Pesach Seder begins on the first full moon fol­low­ing the Ver­nal Equinox.